Methods for screening compounds that modulate umami taste signaling in taste cells are provided. The system includes a system server platform that communicates with fixed PC’s, servers and mobile devices operated by users. Portions of the meandering conductive layer defines a predetermined tab ratio. The image compression circuit compresses a current image signal obtained following a preceding image signal with this optimal compression ratio. The protection posts 26 are arranged such that the diameter of each of the columnar protection posts 26 is greater than a diameter of the alignment mark 24. The accelerator further includes a pair of conductive capacitively coupled noses secured to side walls of the first coupling body, wherein the pair of noses have equal lengths.